I found the solution to my problem in the Script Log window which shows the manual commands in python

Hi,

I know how to apply a material to an object, but I would like to know how to apply a material to one of the object's selections only.

Hi
C4D has a command which allows to weld points of a mesh.
I would like to make a script in python which would allow me to weld very close points.
How can I call this command with python ?

Hi,
I would like to add points to a spline, spreading them evenly, without changing the shape of this spline.
I can do a python script, but is there a simple way to make this change ?

Hi,

I am using a datafield of type AddEditNumberArrows, and I want to have increase or decresase of 0.1

I defined it like this:

self.AddEditNumberArrows(datafield_displacement,c4d.BFH_LEFT,70,10) 

And I initialized it in the following way:

self.SetFloat(datafield_displacement,0.1,min=0.0)

Currently, the values of increments or decrementations are egal to 1.

How to have 0.1 ?

Indeed, it is necessary to use two matrices
For an object named polygonName, we will have:

Matrix = polygonName.GetMg ()
inverseMatrix = ~ Matrix

Matrix converts local coordinates to global coordinates.
After finishing working in global coordinates, we return to local coordinates with inverseMatrix
We can thus modify the polygon with the new local coordinates.

These two matrices allow to work with the points, which is very convenient.

This subject is very well explained here:
Link

Hi,

C4D has a complex coordinate system.

• world coordinates
• local coordinates
• object coordinates (we can see them in the outliner, for selected object)

For the problem I am asking, I don't wish to have a general theory answer, concerning the coordinates system, but to obtain precise answers.

Here is my problem:

For a polygon, we can get easily the array of points and then display the position of this points as follows:

tabPoint = polygon.GetAllPoints()
for point in tabPoint:
	print point

But I would like to knowhow to display the position of points of this polygon in the World coordinates ?
Then if I change the World coordinates of some points, how to convert this coordinates for modify the array of points for this polygon ?

I indicate below in what order are these two questions:

• Step 1: access the array of points for a polygon and therefore access the coordinates (very easy)
• Step 2: Conversion of these coordinates to world coordinates (first question)
• Step 3: change the position of some points of this polygon in the world coordinates (very easy)
• Step 4: Conversion of these world coordinates to the format of the array of points for this polygon (second question)
• Step 5: Modification of this polygon with the new array of point (very easy)

You may want to know why I am asking these questions, here is the reason.
I have two polygons that represent cliffs, but they do not coincide very well.
I have to bring closer the dots of theses cliffs to obtain a perfect join.
I'm doing this work to make a canyon that I started in opensim (see link below)
my cliffs before the junction of points
My points alignment algorithm works well, but I'm stumbling on that damned C4D coordinate system !

It was indeed the modal window that prevented the real-time display of objects.
By putting the code below, the display of objects is immediate.

class MyCommandData(c4d.plugins.CommandData):
def Execute(self, doc):
self.dlg = MyDialog()
self.dlg.Open(c4d.DLG_TYPE_ASYNC, -1, -1, 400, 200)
return True

However, the plugin window opens to the left of my screen and to move it to the center of the screen, I must first enlarge it.
I find that a little strange !

But it can be considered that my problem is solved.

Thank you for your answers

Hi,
I an converting all my C.O.F.F.E.E scripts to python.
But I have a problem with python at the real-time display of the objects I create.
I synthesized this problem in the simplified script below.
If I press on the button <Creation null polygon> the polygon will only show on the screen when I close the plugin window.
How to make the polygon appear on the screen without being obliged to close the plugin window ?

import c4d
from c4d import gui, documents

button_1 = 1000

class MyDialog(c4d.gui.GeDialog):
	def CreateLayout(self):
		self.SetTitle("Creation polygon")	
		self.AddButton(button_1, c4d.BFH_LEFT, 300, 24, "Creation null polygon")
		self.GroupEnd()
		
		return True

	def Command(self, cid, msg):
		if cid == button_1:
			polygon = c4d.BaseObject(c4d.Opolygon)
			doc = c4d.documents.GetActiveDocument()
			doc.InsertObject(polygon)  
			c4d.EventAdd()

		return True

class MyCommandData(c4d.plugins.CommandData):
	def Execute(self, doc):
		dlg = MyDialog()
		dlg.Open(c4d.DLG_TYPE_MODAL, -1, -1, 400, 200)
		dlg.InitValues(self)
		return True

if __name__ == "__main__":
	c4d.plugins.RegisterCommandPlugin(id=10000015, 
                                      str="Creation polygon", 
                                      info=0, 
                                      icon=c4d.bitmaps.BaseBitmap(), 
                                      help="", 
                                      dat=MyCommandData())

I used the frame of your code to make plugins from scripts that I wrote, and now I can send my results to the console.
Thanks